M2.2 earthquake 158 km WSW of Adak, Alaska

A magnitude 2.2 earthquake struck 158 km WSW of Adak, Alaska on Mon, Mar 9, 2020, 7:32 AM HADT (16:32 UTC), 13 km (8 mi) below the surface.

A larger quake followed: M4.8 138 km WSW of Adak, Alaska. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
2.16	ML, local (Richter)	AV	Preferred · Final · ±0.24 · 18 stations
2.1	ML, local (Richter)	Alaska Earthquake Center	Preliminary

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

Within 100 km, magnitude 1.5 and up: 187 in the 60 days after this one and 167 in the 30 days before it.

The first 60 of 187.

From the USGS Earthquake Hazards Program and its partner networks, event av62144566 (also filed as ak02036dstx3). Read Thu, Oct 1, 2026, 9:23 AM UTC.